学术数据库优秀期刊 《中文科技期刊数据库》来源期刊

To reveal the regulation mechanism of capacitive discharge circuit parameters on energy transmission and ignition reliability of semiconductor bridge (SCB) pyrotechnics under long-cable conditions, comparative experiments were conducted on SCB bridges and igniters at a working voltage of 24 V by varying cable length (0.5~2.5 m), cross-sectional area (0.15~0.30 mm2), and energy storage capacitance (10~68 μF). A three-parameter evaluation system“effective energy utilization rate, explosion energy utilization rate, and energy margin”was established based on the energy conservation principle. The waveform criterion distinguishing the electro-thermal process (no dual voltage peaks, ΔU≈0) from the electro-explosive process (dual voltage peaks, ΔU>0) was clarified. The results show that loop impedance increases with cable length and decreases with cross-sectional area. When the impedance increases slightly, the electro-explosive energy of the bridge remains basically stable and the effective energy utilization rate fluctuates slightly; when the impedance increases significantly, cable loss increases sharply, resulting in a remarkable decrease in electro-explosive energy and utilization rate. The power peak remains stable when the capacitor capacity is ≥22 μF and drops sharply when it is <22 μF. Increasing the capacitor capacity reduces the effective utilization rate, improves the energy margin, and shortens the explosion time. The optimal matching under 24 V conditions is achieved with a capacitor of 68 μF, a cable cross-sectional area of 0.2 mm2, and a length of less than 1.0 m; when the cable is extended, the capacitor capacity should be increased synchronously to ensure an energy margin greater than 12%.